Hostname: page-component-5c6d5d7d68-wpx84 Total loading time: 0 Render date: 2024-08-14T20:25:54.492Z Has data issue: false hasContentIssue false
  • English
  • Français

Deformation behavior and high-temperature stability of unidirectionally solidified, twin phase TiAl

Published online by Cambridge University Press:  31 January 2011

G.H. Fair ,
J.V. Wood ,
T. Nakano  and
Y. Umakoshi
G.H. Fair
Affiliation:
Department of Materials Engineering and Materials Design, University of Nottingham, England
J.V. Wood
Affiliation:
Department of Materials Engineering and Materials Design, University of Nottingham, England
T. Nakano
Affiliation:
Department of Materials Science and Engineering, Osaka University, Japan
Y. Umakoshi
Affiliation:
Department of Materials Science and Engineering, Osaka University, Japan
Get access

Abstract

Ti−50.8% Al has been cast using unidirectional solidification to produce specimens with a highly directional structure. Each specimen consisted of the intermetallic phases, TiAl and Ti3Al. Both phases existed as single crystal lamellae which were parallel to each other throughout the specimen and aligned along specific crystallographic orientations. Mechanical properties were assessed by deforming specimens such that slip occurred in different directions relative to the lamellae. High-temperature stability was assessed by heating for various times and examining the microstructure. Deformation revealed a highly anisotropic structure since ductility depended upon the principal direction of slip. Poor slip, occurring in a direction through the lamellae, was attributed to the Ti3Al phase where cracking initiated. Heating at 1200 °C resulted in recrystallization of the TiAl phase. The recrystallization started at the ends of the specimens as a result of residual mechanical damage, before spreading along individual lamellae into the bulk.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 8 , August 1993 , pp. 1812 - 1816
Copyright
Copyright © Materials Research Society 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Kim, Y.-W. and Froes, F. H., High Temperature Aluminides and Intermetallics, edited by Wang, S.H., Liu, C.T., Pope, D.P., and Stiegler, J. O. (Min. Met. and Mat. Soc, 1990), p. 465.Google Scholar
2Kim, Y.-W., in High Temperature Ordered Intermetallic Alloys TV, edited by Johnson, L. A., Pope, D. P., and Stiegler, J. O. (Mater. Res. Soc. Symp. Proc. 213, Pittsburgh, PA, 1991), p. 777.Google Scholar
3Lipsitt, H. A., Shechtman, D., and Schafrik, R. E., Metall. Trans. 6A, 1991 (1975).Google Scholar
4Huang, S. C. and Hall, E. L., in High Temperature Ordered Inter-metallic Alloys III, edited by Liu, C.T., Taub, A.I., Stoloff, N.S., and Koch, C. C. (Mater. Res. Soc. Symp. Proc. 133, Pittsburgh, PA, 1989), p. 373.Google Scholar
5Vasudevan, V. K., Court, S. A., Kurath, P., and Fraser, H. L., Scripta Metall. 23, 907 (1989).Google Scholar
6Fujiwara, T., Nakamura, A., Hosomi, M., Nishitani, S. R., Shirai, Y., and Yamaguchi, M., Philos Mag. A 61, 591 (1990).CrossRefGoogle Scholar
7Yamaguchi, M., Nishitani, S. R., and Shirai, Y., in High Temperature Aluminides and Intermetallics, edited by Wang, S. H., Liu, C. T., Pope, D.P., and Stiegler, J.O. (Min. Met. and Mat. Soc, 1990), p. 63.Google Scholar
8Maeda, T., Okada, M., and Shida, Y., in High Temperature Ordered Intermetallic Alloys IV, edited by Johnson, L. A., Pope, D. P., and Stiegler, J. O. (Mater. Res. Soc. Symp. Proc. 213, Pittsburgh, PA, 1991), p. 555.Google Scholar
9Umakoshi, Y., Nakano, T., and Yamane, T., Scripta Metall. 25, 1525 (1991).Google Scholar